Bitumen shingles are a popular material for roofing, especially in garden houses, sheds and outbuildings. No wonder - the practical shingles are durable, inexpensive and can be attached relatively easily yourself. But if, after years, the shingle roof starts leaking, good advice is expensive. You can find out how to cover a shingle roof in our guide.
Prepare the roof
After about 20 years, a shingle roof with bitumen shingles can start to leak. You don't have to re-cover the entire roof to get rid of cracks and leaks. You can cover the old clapboard instead.
The right preparation is essential for this:
- Remove coarse dirt from the roof. Use a broom or brush and sweep the roof off thoroughly. If you are sure of the roof substructure, you can also use a high-pressure cleaner.
- Wait until the roof is completely dry.
- Apply a stabilizing primer to the old bitumen shingles. These primers are available from specialist retailers as solvent-free and solvent-free versions and serve to promote adhesion between the old and the new roof covering.
- Let the primer dry according to the manufacturer's instructions.
Cover the roof with a welding membrane
One of the easiest ways to cover a leaky bitumen shingle roof is to use welding sheeting.
Welding membrane is also based on bitumen, so the roof coverings harmonize well with each other.
This is how you proceed when laying the bitumen sheeting on the old shingles:
- Fasten the first layer of bitumen welding membrane to the old roof shingles with cold glue. Work carefully, especially on pitched roofs, so that the very heavy sheets cannot slip.
- Glue on the second layer of bitumen sheeting with a slight offset to the first layer while hot.
- To do this, heat the underside of the welding line with a gas burner (€ 38.99 on Amazon *) . Pay attention to the correct temperature: the bitumen should become evenly viscous when heated.
- Glue the strips on one after the other. Pay attention to the necessary overlap between strips and joints of at least 8-15cm.
- A small bitumen bead should form on the edges. This is a sign of a good, tight bond.
Then put the facing back on the verges. Your old roof will be reliably sealed again for the next few years and even decades.